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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99218561a43dc64615ebe58cac2c6030c0da939d695ca6ca2c16f237ef9bd6e7' 
  AND token = '9flwNRlRALKBnopFBwB8iKc3UN/0DIkWO+DrGj5TOoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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