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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0aac71024df1b8c55b25bc85cd9004303d7dcee74ec9b56589e87c34d432a5' 
  AND token = '8KM+wfQ8VAfpb1L+i1LuPr0W/6S3ZZDeU1ua2M5VlXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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