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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fee49d23d8326c99d475973745e13c4804de18a632c463263f13eea2b48be1e' 
  AND token = 'jAkUcVcBeydgW6n92Gs/I57la6qGEt1VeAEn/3+i6HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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