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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d2d41a77d20cf71248958b1a9ce3956f202cc4acb120b8a462a93eee2a28f5' 
  AND token = 'LVDvW+8qZ09uxnbfEehcS9+zXAyiPnLt8W8Flo3nOaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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