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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd25a4322bb8f1383e9b45375b315552c331005f905adfee67f582d76a9a43558' 
  AND token = 'HJWdpJrl5GdaYUNJr2WGz9Jvgb9HFH8dvAG1L1QfEBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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