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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10a6ebdb3260f9c06e98e538df48845483cae59ffa8c1290dc93ec377c45f620' 
  AND token = 'mH/YE4QAvPm7Y4jNfpZOpvH+rV3ID8K4TN6b6taiGRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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