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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43093380b50e46d91dd567194e4ebe6be1c316c984ed8e0b40b8dd95e586bd43' 
  AND token = 'AVah74dxFWlMKETrWDBiuawc+RuQgDLiJHuR9KzlQcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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