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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb90a0922532bf0f218b126f5575a77c209724e7bcf8638218e354b505f847f' 
  AND token = 'rSBoee3U2qx8iSypnuEfTrQhbOGerHQEbtgueaxIPWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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