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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca5e438c4d51cb99eb79d620d96ab5eaf212609895df01953e168e557c953b34' 
  AND token = '3/VHzHVUKHTdD8jyjGFd8gNXQ8B8eRHM/9WHcDX9rRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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