SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c157627a0525b87acafdc06f197a9d7eb21a54158d8c7ab6db18cab7c63ead1' 
  AND token = 'cN07eZaI/DmiwfyPnNfAzncmTc0jEvKFKA2lTO3Xtg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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