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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f9753833034f17860ce8817d64d563a10b071575f7b6b6bd001357bc881a4b' 
  AND token = 'dj76VESB9bGWd9YJpiGJ/oxLDwWx/OMHB3vWGHGe16I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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