SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceca16772de016ab7324592f9c47a28ff2132098803f367bafc835549ae64226' 
  AND token = 't9Um7IvJbXQg81BquNXYWtS/WkVwI41dLlqz9Mg6JZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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