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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e64233963088706806fb216efb34f6166583e9161cbc13157099d762d572018' 
  AND token = '1rx3UpXSTQbecS+ZZNKMWHhn3/RqQVG3erDW3r5Lgck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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