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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '119a74f85c9c82de4e24561a435f9db0e94257739d9dbf47674121379f448e07' 
  AND token = 'Uc4UTGezkQa0UV2jsGUB1eE1zsI52zBFwEWlK9XEKJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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