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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553cdb1724f1e2868a42ddb0ed53af3af2089a8b45a0602e9d423c9cb2f162cd' 
  AND token = 'QXYUfLpdt95cmr1OPpHdZBG81IOt96qpCEBefTVm1IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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