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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ff247af62540a2a391eedc5259dee503ec85f598520afe77f2b5227ef862d14' 
  AND token = 'RWGxt7gOl99I9c9Wk/76GLCdJ1Wsj0sK0lWPIBrh95Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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