SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adebc3d910855e480cc5118e416e6ac6b5a2cbdb2663d693158ea17ff4cefe8d' 
  AND token = 'nJPjRz4XjE3H+mLTBrp9GpVQqWZJYJWomXZmPFc+H68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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