SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '574e25caf4d6d82b67374891a36ce3b26209cd23c195cf53beee8f4385851e77' 
  AND token = 'vJZh56aWsWujIvu4mq2yYo+HCHUd5tUc/FFheEIYLx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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