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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e2845fbfbdfe50e55ce8d8da4d246e50083be240f1c2d6f6e049ce6c1af4f41' 
  AND token = 'x6eeZj0uVnZPghKjz9yMUjZxTIWPdOJUmI7zSBe/0yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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