SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9226fc0c2efcb3b061839459ec6d284caeb678766bb7e83cd54cba3043cd5ae2' 
  AND token = 'nQHSLanGQ6tElWnVFrRuIBlCCmW03HvYkO1r6jkBxYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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