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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c94b6c17364318ad3b93d81cbdd4d48e529834241aa5302042cd7ff418bde1c4' 
  AND token = 'ZD1UpsoQAHBMJEQNuhdoFznl4Im8fNLpNS1iuJ+zBmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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