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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744e95a882ca58966dcd7a6a1d03a5ebb7330dbfb8e2d68b4287d73deafb700b' 
  AND token = 'Ws83MeHFhJXdgXtlJhMvrUEfOJqHmry1IAr2t9j8uBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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