SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c773462abfb9a6ede36827c7061884c468d67048ff74ea8b374d2e1a59e05eb' 
  AND token = 'HyU3GuwNFiUHhow+e1zpBHhfBMm/Lj9YUT9g0W80SB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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