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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0512fbc5eb55900f90da55703af88d9c30586af53188afb96994948319998db' 
  AND token = 'NBNh6KXr021mXgX4zIRBSUno2TFaNQuIsY8PJH2ju6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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