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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f29bda8b8a69c0023bd2799bec89ba9644d7b8b136c7210f3b565565284a17' 
  AND token = '1759fRSzX/ShZqAWu4ZtMP1el5wONrg81WFuNdC8MSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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