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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad30df6adc50243c8137c2286551cb9d07cda829dbf6df667db07bc7cb2f013' 
  AND token = 's3MfRJbkXJ8OFK6Nvhm8ymb/ZfkyIX6UoIvdFmicHe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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