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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '224595b091067ea06433686a584b08d4d9d0b9e891382ec9abda6fd729856099' 
  AND token = 'GcQTs1qpnJXm5wIWT6EniBaoQ9Mb5wkYVG1jgfZOIAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}