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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c089a544f48d2d9d41272d0b3a1c44e3aeb523426cb1389e7951c93b78597c9' 
  AND token = 'xtOjze9qkr5ubSPLcUYFj1B31QJxKrc9StflbyarY9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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