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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4437e6bb727c9ace65198295d319345442a94aaceafef41364fd5d11f7be524c' 
  AND token = 'u9wbrWH/M0+LWt1xDl3K08YLvp2NknRErVSHFIlyKCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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