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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d4a77448cf7c77ff3b901e4c498566713ba43e925b97b0970705d81ac0e80e' 
  AND token = 'K446VAcfgsIrrBdCQNNtT9C26Pgq5Vz3RUg/UkLvME4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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