SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07279203d0c2e6771246d28edb93cabdfa247109950f6471d94d04d588ac4cb7' 
  AND token = '/rok2Q6G+stNjhHbCGYfJWjVT+3LU/BhXnVtDlVPN+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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