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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd60462bd97d8c323869373ba49d96bafc08b4692a3f935147b78a3a1a14e5153' 
  AND token = 'lf4SVvqOxYet2QShrHIbI2OpduSsthlcpJD4cWV9wkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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