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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c4ad7664ffe618b2db4fc92d50e94ca860a4014e3e325721afc801bfcd771e6' 
  AND token = 'CG23ck7zNfHH+0lzoPP/blLDJ55BYnupAJbV0cByG1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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