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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05424d85157976cf296e35c9888a3ae1ac964b9dad94edd948847a3bbbaabce4' 
  AND token = 'MmLO29MLEhuQh7BzYUj4dJ5AlIitIe8Bj/w73ncROG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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