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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1428e7e9d6d8cf92cc4cebd33484e2f1fa91bc7e91942f6e7035b6ab0be958a0' 
  AND token = '+hHD3keZM0OWJezPq8FwTNXCbg1Xp63Q9TwXquSUE+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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