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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dcc9e978ffb048a01b2024b7640e6be83f080ff52ccc06cff2d6a14077c54f1' 
  AND token = 'uiPrSIIb9j/Z8SfZaxSWfi3IS6YRjzRlc79iILVEdPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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