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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '862527dc29c22905230100e76325bf7117d765648f7ccc37cef09c94552266d2' 
  AND token = 'NSlZzI5maSZSzeM/lPPD1FOr0TLvRaePcgUuvWqBZxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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