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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6194502fe4fa5ae4bb91dd199a92ecd4b2fc2b83354a50876abd7f7cf7dee89' 
  AND token = 'AofBvfmDOOK6q4a76EIxQ2jzc/zkAqtmeUMIdu+sl/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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