SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f679ecd071630a241403ae850c82aa575bb5f536be3e3112e9497be36a2ac241' 
  AND token = 'ADkiJgXhBEN0TZgCz/27hw/BGgZV55E+QUpW3cvlhFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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