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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfecc4e34984fc3e9c88a4bce026af1090d2aeef053e35bb44803fdabd320609' 
  AND token = 'jWVDJaYZbm14aTuiBDYMorzUruIoF813CI5+5Aff5kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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