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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '982767a2448885808fd88bb264388ad90ce02a6c4aa2f64b07678c46b192e557' 
  AND token = 'QvwUE95WlJEZNwaAVzoMlOAnB1/zwxSeKXY9gidxn6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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