SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '680783d9fa27e8e68aa5a86f83e66aa9aef60172fbde76b9c23ad49410f76d22' 
  AND token = 'Faj8PgtP9z4LfKwH6qpL/hoRmBCZ+nPWYDsC7c+vPaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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