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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec9629050446c9f5d339b106e52695650732b8ea89ab2fa38a97bbd33211c28' 
  AND token = 'DC75WhOl0e2fK+ycZHu5ud4aondoJfxur2M9YvLNpxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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