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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17cfeac947e684ef550723a761014e1e962c144efa6d98f9ee5204c557c27ac0' 
  AND token = 'kyMzoGs5xrHFKzjazoUYLicvvZ8Et1330qaiTJQPGew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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