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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '748a74e8ecac914399de6ff3b56ae5a11b8acb5deefd1410f573bed4e5822ef8' 
  AND token = 'sM0Yxxa0i/Mw5n2yuUR77dZuPHUW2sCYwHVfvf827O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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