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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8abab1468696374f56b4c16e94dc5561a9192980ea57e6ecc504a9828542023f' 
  AND token = 'pGxY9mIK9nYu8bkgvs9LEbxEnKVbSy5wV8FyjuY2t1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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