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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1882860138c3be292cc4a22e0215349b4888981d7467b5bed0a957501db27e0' 
  AND token = 'FK8k4k4N6RN9tiyWxgiTrJ0XjsgNdRxqQcjATyE18xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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