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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf67df5e8b8f6ea80f4e7d5d6697c2ff8f4135ea2bf5d0ac9f278668c6cdc14b' 
  AND token = '4/9XM9HTUJtiKWhLbCdpnp2sE+7CETAQFDUsU0bGUI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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