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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92119472aecf0a59d6e918fa1ca7caba54c0bf0da18c958bbbc49bc38c71d126' 
  AND token = 'gzjd5KlDzlz9l38UbolI2gMwEY+SVy7sPyUfu+WjkjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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