SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c711ca88825e5532406c35945fa4db1af2bf834659545756a3710f0f9e0654c' 
  AND token = 'jioYQpdxYfpmvMsN3VrgAPfG/36XzMbMRGHHyYiYo1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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