SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bfeda7de170d025688513d19748971684a1611943639a2450e5686bdbbb29c5' 
  AND token = 'JZtE8rYrCuwa8OImJEIeGF6KFUfNwFAEsC6zBwfgxvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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