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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cfbbe83e8216ddf3dd67967ed9074caeaccf1939055d913f36709e9ee5d4121' 
  AND token = 'eQ8C97Zw7mi8yWDdGCbKXuvmpVZvk/U/Yxn6Efw8g8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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