SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9df392919ff714cf6948f633ee43252019f549c3c18a1b16b0b7afcd585ccc0' 
  AND token = 'qSxvuqitTBXr69dpWZNFlh+GE8jWuSYSiS7mPoEOZPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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