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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c956da5d8944d932f9332fb7a951d8e067abef62b26a68633754a32dc6b8a5dd' 
  AND token = '9s5c2xN+hNmJr6YTsH+TUhSJ8iV5XqF66MSjPP1uIUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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