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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd940c43c414d0ff5809f6831e601058de25402a8a7feca4ba0c962947c7349cd' 
  AND token = 'yOKusZ8nkueCHegKleFJ4G9TgrnWsSCXVHZ3LAKFuU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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