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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37314c61cf002a6ab7e08a9167c897a1c041a2a4f644dbe35402f34475ccb53e' 
  AND token = 'z1BKt9LC1FBBDcZgWs8z1c9lAAhppgSo7E+TT6rH70Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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