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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f1b4a7ecc6896a75dfc3de321036ea2270662874753b731a499a3ced781591e' 
  AND token = 'Audz2pU5E6d0bEP79W5c/6RR6qXB/GKRRK/Ia3iH9Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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