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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347f85e9a8e54143c77ebb7fcc90d24acd6b94712ef357cf0f37df80e84a9ae6' 
  AND token = 'QnOp29ta3QwiWnqQz9oGIK/qcMtF4XW9bl/wCd7enK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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