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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eee420663f42b6396d564472f8aa58907a1fb0121b1e04af8ab220455fdf2b9' 
  AND token = 'Y7vgWq7r/4NJirirC8VLyA4IZTfnhFWgk9YNe2Z+HcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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