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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b5a4df163e0ee95d7e59ee9e9b1b4042cb562a6a72768bdd84d8f217ac8e5d7' 
  AND token = '13Ndt4rwNPtKQrMlD7ba8uFBHFgjr64AuBO5Vs5CK2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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