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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9668ada3e65dde3aa6c695e9b39535d21897fc54aa108f4f083252c72732e94' 
  AND token = 'zpoOx8NQ9LE1BHk+86BVxD4x74xjmL77P3j1l6yMew0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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