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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698bb280c6a8be856f93abfdf8c5b3b70ba12f4ee7b106b57b135034d1188333' 
  AND token = 'E+r8ELdvkrWl4O7wg/yc+0GDFnB9rc2Ri6ne0F3hCx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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