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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e39b5837ab16298dcf5a95c0f65798afe2e6dbbe40d97e081ce9d336ae25a5' 
  AND token = 'l+7CxvwpOxsUpncg77k4ujF4QpgsA1jUdqxs0RAde6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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