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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '464d3cdb8db317e3a55d5b3093f52b91f927fd2fcfdd29e39ec35b56fe6e0946' 
  AND token = '78H/4hlmcjKpT8HaLKYCNvC90A0Sldw5u7sCwjb+kCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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