SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1605b494ac6a6f5e108654099ccab36a2b8666bee8b74caf79576fadff123c3c' 
  AND token = 'VuGTYfyQqPzLKmsEoX96lZm3Qjnu0QWCzF0gHZlS+sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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