SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '901d7ce407c9b724eb9f2173dc688676ca7fb01e36dda62a88e6be4cb898c5f0' 
  AND token = 'Nd58zuS/kdSwPJEsfAXHqPVtoX3TnZwgZ2CoDRdrz9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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